Combined hydrometer and syringe.



PATENTED APR. 5, 1904.

R. VAN BENTHUYSEN. COMBINED HYDROMBTER AND SYRINGE.

APPLICATION FILED JUNE 29, 1903.

H0 MODEL.

WI 7 'NE SSE S:

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II'UNITED STATES Patented April 5, i904.

PATENT ()FFICE.

coMBmEo HYDROMETEB AND svnmes.

- SPECIFICATION forming part of Letters Patent No. 756,546,

dated April 5, 1904.

' Application filedll'nne 29, 1963, Serial Ne. 163,509. (l lo model.) i

To all whom it may concern:

' -Be it known that 1, ROBERT VAN BENTHUY- SEN, a citizen of the United States, and a resi- Reference is dent of Newark, in the county of Essex and State of New Jersey, have invented a new and Improved Combined Hydrometer and Syringe, of which the following is a full, clear,

and exact description. I

The purpose of my invention is to prevent hydrometer-tubes from touching the side walls of syringe barrels and to provide means whereby to prevent rotary motion of the. hydrometer in said barrels.

A further purpose of the invention is to "'11 construct the reading or scale section of a hydrometer-tube that it will be polygonal in cross-section, having areading upon one face, for example, indicating density, upon another facedegrees Baum, and upon the third face a reading setting forth a required percentage of liquid or fluid to bring the solution tested to proper density, which reading is that illus- 'trated.

Another purpose of the invention is to provide wings at the bottom or lower portion of the hydrometer-tube, which by engagement with the contents of thesyringe-tube will prevent the hydrometer-tube from having rotary Ynotion while in use, thereby further facilitating the reading of the scale-section of the hydrometer.

A further purpose of the invention is, by producing an apertured obstruction in the syringe-tube, to obtain a valve-action when the hydrometer rises so high that the upper bulb or swell in the lower portion of the hydrometer-tube is brought into engagement with the aforesaid apertured obstruction, at which time the said liquid or fluid seeking entrance at the inlet of the syringe-tube will be cut off from the compression-bulb of the syringe-tube, preserving the said bulb against detrimental action from such source. The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out inthe claims.

' to be had to the accompanying drawings, forminga part of this specification,

' syringe-tube in which similar characters of reference ind r' cate corresponding parts in all the figures.

Figure 1 is a vertical section through: the body portion of the device, thebulb of the being partially in side elevation and partially broken away. Fig. 2 is atransverse'section taken practically on the line 22 of Fig. 1, being drawn on a larger scale; and Fig. 3 is a similar section taken substantially on the line 3 3 of Fig. 1, being drawn on the same scale as the parts shown in Fig. 2.-

A represents a syringe-tube of any desired length and of any desired diameter. The said syringe-tube A,'which is preferably made of glass, is provided with an upper neck member 10, into which the shank 1.1 of a rubber compression-bulb B is introduced, said compression-bulb B being of any approved 'onstruction. As shown, the said bulb isfw vided with a central passage 12 in its shank, communicating with the interior of the syringe-tube A.

At the lower end of, the syringe-tube A a nozzle 13 is formed continuous with the said tube and of less diameter than the body of the tube. This nozzle is closed at its lower end, except that a central opening 14 is produced in the bottom portion of the nozzle, through which liquid of any description may be drawn up into the syringe-tube by the action of the compression-bulb B. Where the body of the syringe-tube A connects with the nozzle 13, a segmental seat 15 is formed, as is shown in Fig. 1, and preferably about centrally ben tween the ends of the syringe-tube A anexterior annular depression. 16 is roduc'ed, (shown best in Fig. 1,) thereby formingan inner annular flange 17 dividing the syringetube A into an uppercompartment a and a lower compartment a, the two compartments being connected by a passage-way a, as is also shown in Fig. 1.

' The hydrometer O is located as usual in the lower portion of the syringe-tube'A, and in the construction of the hydrometer C an upper tubular scale-section 18 is formed,,which scalesect-ion, as is best shown in Fig. 2, is

shown as exteriorly triangular in cross-sec- 'tion. Upon one face of this reading or scale v section 18 of the hydrometer a scaleindicat ing density is produced, on another face a scale representing degrees Baurne' is likewise produced, and on the third face a scale is made which indicates the required percentage of liquid or fluid necessary to bring the solu: tion being tested to the proper density. This reading or scale section 18 of the hydrorneter is continuous with and in direct communication with the usual elongated reception-bulb 19, which reception-bulb 19 is connected by a suitable neck 21 with a lower weight-carrying spherical bulb 20, the latter bulb 20 being adapted in the normal position of the hydrometer to rest upon the seat 15.

It will be observed that the upper scale or reading section 18 of the hydrometer 0, when the hydrometer is in its lower or normal position, extends up into the upper compartment or chamber a of the syringe-tube A and that the inwardly-extending annular flange 17, formed in the syringe-tube A, affords the said reading or scale section a of the hydrometer sufficient play for all practical purposes, yet at the same times serves to maintain the said portion of the hydrometer in a vertical or perpendicular position, thus facilitating the reading of any of the scales produced upon the said portion of the hydrometer.

At opposite sides of the portion 21, between the elongated receptacle l9 and the weightcarrying bulb 20 at the bottom of the hydrorneter, wings 22 are formed, and these wings,- as isespecially shown in Fig. 3, engage with the liquid in the lower compartment a of the syringe-tube A and servein action to prevent the hydrometer from havinga rotar motion, which motion materially interferes with the accurate and convenient reading of the scales on the reading-section 18 of the hydrozneter. Furthermore, it is obvious that in a test when the hydrometer is carried upward by the incoming fluid and thehydroineter reaches such a high point as to bring the elongated reception-bulb 19' in engagement with the inner flange 17 of the syringe-tube or equivalent obstruction the upper bulb will close communication between the two chambers or com partments or and .a and will effectually prevent any excess of fluid entering the syringe-tube by the operation of the compression-bulb B from passing up into the upper chamber or compartment a and being brought into contactwith the compression limlb l) to the detriment of the latter.

It will be observed that in the construction of this syringe due consideration has been given to the proper operation of the hydron'ieter in the syringetube,and, furthermore, that I I I I I I I I I I (I I I I I I I, f I I reams all possibility of any of the fluid reaching parts not desirable to be so reached is efi 'ectnally obviated.

In i l have shown a reading setting forth the required percentage of liquid or fluid to bring a solution-as, example, a battery solutionto proper densit such scale reading in opposite directions from O to 25, or a greater or a less figure. In reading the scale upward the percentage of acid is indicat'ed. Upon reading the scale downward the percentage of water is indicated. For example, the reading is 10 in the upper division of the scale it will indicate that ten per cent. of acid is required to bring the solution to normal state, and if the reading is l0 in the lower division the scale ten per cent. of water should be added to bring the solution to the proper strength.

Having thus described my invention, 1 claim 8 new and desire to secure by Letters Patent 4 1. T he herein-described instrument, consisting of a syringe-tube provided with a compression-bulb at its upper end and having a nozzle at its lower end, which nozzle has a bottom opening, the said syringe-tube having an interiorly-reduced diameter between its ends, and a hydrozneter adapted to have its lower end normally seated in the said syringetube above the nozzle end of the tube, the readingsection of the hydrometer being adapted to pass through the contracted portion within the syringe-tube, whereby the hydrometer is held in a vertical position and is preserved against .undue lateral play to facilitate the reading of the scales on the hydrometer, as and for the purpose described.

The hcrein-described instrmnent, comprising a syringe having a transparent barrel, a guide within the barrel of the syringe, a hydrometer movable in said barrel, the reading section of which hydrorneter passes loosely within and through the said guide, whereby to substantially center the hydrometcr and prevent the reading-section from engaging with the side walls of the barrel, and wings adjacent to the bulb of the hydrometer, extending from opposite sides thereof, which wings serve to prevent the hydrometer from being given rotary'movement in the said barrel the action of liquid contained therein, as specified.

ln tetimony whereof lhave signed my name tothis speciiicatim'l in the presence of two subscribing .vitnessrs.

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